ATC 2.1.7

What Is ATC?

Name: What Is ATC?
Author: Renato Alexandre dos Santos Freitas

What Advanced Trigonometry Calculator is, what problems it solves, who it is for, and why local open-source mathematical computing is useful.

What Advanced Trigonometry Calculator Is

ATC is an open-source mathematical computing engine written mainly in C/C++ and packaged as a Windows desktop console application. It was created in 2011 and is maintained by Renato Alexandre dos Santos Freitas.

It is built for users who want direct command-driven calculation, scripting, and local execution without depending on a cloud service.

Problems It Solves

Fast scientific and engineering-style calculations.
Supported equation solving and polynomial workflows.
Complex numbers, matrices, statistics, geometry, physics, conversions, DSP and FFT tasks.
Repeatable TXT processing and script-based automation.

Who It Is For

ATC is useful for students, educators, programmers, technical users, and people who prefer transparent local tools for repeatable math workflows.

Why Local and Open Source Matters

GPLv3 licensing, local execution, and a C/C++ codebase make ATC inspectable, portable across Windows setups, and available for long-term preservation.